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The differences in North Atlantic and Mediterranean storm tracks between the phases of the Quasi‐Biennial Oscillation (QBO) and El Niño–Southern Oscillation (ENSO) are investigated using a form of wave‐activity diagnostic suitable for transient eddies. Using the JRA‐55 reanalysis data for the 60‐year period 1958–2017, various monthly‐mean diagnostics for the wave‐activity flux and its divergence are presented, with focus on the 300‐hPa level as representing the upper‐tropospheric activity. This is carried out for the phases of the QBO and ENSO separately, as well as for their joint distributions, during early and late winter, corresponding to November–December and January–March periods, respectively. Results show that, in both early and late winter, the sole impact of the QBO manifests itself in making the Mediterranean storm track stronger during the easterly phase of the QBO. There is a significant …